这才是高手！！！

struct _LINK_NODE { USHORT link_size; ULONG link_id; USHORT link_name_size; union { struct _LINK_NODE_INFO { ULONG class_id:4; ULONG cross_cnt:3; ULONG link_name_flg:1; ULONG reserved:24; } st_link_info; ULONG ul_link_info; } link_info;}